This is a map I drew up a few years ago. I use it as a setting for all my Dungeons and Dragons campaigns. I'm looking to start fresh in Photoshop, making it a little more realistic looking with also trying to keep in some magical effects/ideas from the DnD books(Such as a dragon clearing out a patch of woods, or Umber hulks creating canyons.).

I have no idea at all how rivers naturally grow, where swamps should be, and so on. Any advice would be appreciated!

I kind of like the idea of the 'edge of the world' which is why I drew the continents so square.